docs: improve React quickstart with error handling and fix Docker capitalization (#45320)

## I have read the CONTRIBUTING.md file.

YES

## What kind of change does this PR introduce?

Docs update

## What is the current behavior?

- The React quickstart example does not handle errors when fetching
data.
- The local development guide uses inconsistent capitalization for
"docker".

## What is the new behavior?

- Adds basic error handling (`error` check) in the React quickstart
example to improve reliability.
- Fixes capitalization from "docker" → "Docker" for consistency with
official naming.

## Additional context

These are small improvements to enhance clarity and developer experience
in the docs.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* Enhanced React quickstart guide with error handling for database
queries to prevent invalid data processing
  * Corrected capitalization in local development guide

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

apps/docs/content/guides/getting-started/quickstarts/reactjs.mdx

@@ -102,7 +102,13 @@ hideToc: true
         }, []);
 
         async function getInstruments() {
-          const { data } = await supabase.from("instruments").select();
+          const { data, error } = await supabase.from("instruments").select();
+
+          if (error) {
+            console.error(error);
+            return;
+          }
+
           setInstruments(data);
         }
 

apps/docs/content/guides/local-development.mdx

@@ -116,7 +116,7 @@ As a prerequisite, you must install a container runtime compatible with Docker A
 
 <Admonition type="caution">
 
-If your local development machine is connected to an untrusted public network, you should create a separate docker network and bind to 127.0.0.1 before starting the local development stack. This restricts network access to only your localhost machine.
+If your local development machine is connected to an untrusted public network, you should create a separate Docker network and bind to 127.0.0.1 before starting the local development stack. This restricts network access to only your localhost machine.
 
 ```sh
 docker network create -o 'com.docker.network.bridge.host_binding_ipv4=127.0.0.1' local-network